Drill-steel-sharpening chuck.



J. H. & H. L. SINCLAIR. DRILL STEEL SHARPENING GHUGK.

APPLIOATIOH FILED JUNE 19, 1997.

922,349., Patented May 18, 1909.

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UNITED STATEg PATENT OFFEQE.

JAMES H. SINCLAIR AND HARRY L. SINCLAIR, OF DENVER, COLORADO.

DBILLSTEEL-SHARPENING CHUCK.

Specification of Letters Patent.

Application filed June 19, 1907.

Patented May 18, 1909.

Serial No. 379,699.

To all whom it may concern:

Be it known that we, JAMns I-I. SINCLAIR and HARRY L. SIN LAIR, both citizens of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Drill-Steel-Sharpening Chucks and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Our invention relates to an improved construction of chuck for holding the drill steel and cooperating with the dolly during the drill steel sharpening operation.

The distinguishing feature of our improved chuck, consists of V-shaped grooves formed in the face of the chuck, in alinement with the grooves between the cutting edges formed upon the face of the drill steel.

A dolly of the character used for drill sharpening purposes, in its general structure, is the counterpart of the drill steel sharpening face when the sharpening operation is completed, except that the wings of the dolly which give form to the face of the steel must project outwardly beyond the face of the drill steel. With the ordinary chuck having a plain face beyond the socket for the reception of the drill steel, the dolly cannot pass inwardly beyond the plane of the face of the chuck. /Vith our improved construction having the grooves above explained, the sharpening wings of the dolly are allowed to pass beyond the plane of the face of the chuck, into the said grooves of the chuck, thus forming sharply defined wings upon the face of the drill steel and also wings that extend outwardly more abruptly from the shank of the drill steel, thus leaving a greater amount of clearance space for the rock cuttings, adjacent the cutting face of the steel and around the shank.

Drill steels sharpened in the ordinary way commence to enlarge, due to the upsetting of the sharpening operation, at a considerable distance in the rear of the cutting face of the steel thus taking up an unnecessary amount of space which otherwise could be utilized as a clearance space for the cuttings, and which is so utilized in steels sharpened by the use of our improved chuck.

Having briefly outlined our improved construction, we will proceed to describe the same in detail reference being made to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is an end view of our improved drill sharpening chuck suitably mounted for use, one of the chuck members being shown in elevation and the other in section, a portion of the chuck holding devices being also shown in section. Fig. 2 is a face view of the chuck shown in detail. Fig. 3 is an inside view of one member of the chuck looking into the half socket for the drill steel. Fig. 41 is a section taken on the line ea Fig. 2 showing the drill steel in place but in elevation. Fig. 5 is a fragmentary detail view showing the cutting extremity of a drill steel sharpened by the use of our improved chuck.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a stationary frame work upon which is mounted an adjustable jaw 6 cooperating with the swinging jaw 7 journaled at 7 These aws 6 and 7 are fastened to receive the chuck members 8. These members are dovetailed eXteriorly, to enter recesses of corresponding shape formed in the jaws 6 and 7, and are normally locked in place by plates 9 usually termed gibs. When these plates are removed, there will be sufficient space within the recesses to permit the lateral movement of either chuck memher out of its recess, assuming that the aws are sufiiciently separated for the purpose. T he jaw 6 is adjusted and held in suitable operative relation with its cooperating jaw, by means of a number of stud bolts des ignated 10, 12, 13 and 14, respectively. The gibs 9 are acted on by stud bolts 15, threaded in the respective jaws. These stud bolts acting against the gibs, also serve to hold the chuck members in place within their respective jaws. The said jaws are further positively held in place against longitudinal movement by means of screw pins 16 which are threaded in the jaws but protrude therefrom into recesses 17 formed in the outer wall of each jaw. These recesses as to both of the jaws are illustrated in Fig. 4 while the pin together with the recess of one aw is illustrated in Fig. 1 The drill steel socket formed in the chuck members, is outwardly flared adjacent its face, to permit the upsetting of the cutting extremity of the steel. In this outwardly flared portion of the socket, are shallow V-shaped parts 18 which the exterior walls of the wings 19 of the sharpened drill steel are formed during the sharpening operation. Between each two of these V-shaped socket recesses. 18, is located a V-shaped groove 20, formed in the face of the chuck and leading outwardly from the drill steel socket. These grooves are highly important, since they allow the sharpening wings of the dolly which are longer than the wings of the drill steel, to protrude thereinto and allow the wings of the dolly to pass into the face of the chuck thus permitting a more abrupt offset in the formation of the wings thus making the shank of the drill steel of uniform size up to a point very close to the cutting extremity of the steel (see Figs. 4 and 5), thereby allowing a considerable clearance space designated A in Fig. 5 being the space between the dotted, lines B in said figure and the shank of the steel.

From the foregoing description the use and operation of our improved device will be readily understood. The two chuck members are suitably mounted and adjusted in their respective jaws, after which the drill steel to be sharpened is placed in position, and the swinging jaw brought into operative relation with the other jaw, whereby the drill steel is held securely in place. The

dolly (not shown) is then caused to act upon the cutting extremity of the drill steel until the latter is properly upset. During this operation the wings of the dolly penetrate the grooves in the face of the chuck, whereby the dolly produces a drill steel cutting extremity having abruptly upset, sharply defined and symmetrically formed cutting wings.

Having thus described our invention, what we clalm is:

1. A drill steel sharpening chuck having a socket flared to receive the extremity of the drill steel adjacent its cutting face, the flared extremity being fashioned to form the outer walls of cutting wings upon the drill steel, the

face of the chuck intermediate the wing forming portions of the socket, substantially as described.

In testimony whereof we affix our signatures in presence of two witnesses.

JAMES H. SINCLAIR.

Witnesses:

A. J OBRIEN, DENA NELSON.

HARRY L. SINCLAIR. I 

